GroupManagersForum@groups.io

There's a bug in the way btinternet handles emails sent to the +owner address. See https://groups.io/g/GroupManagersForum/topic/34125793#18881 for details.

The messages are routed to the whole group.

When responding to a moderation message, be sure to select just Reply, not Reply All. Or use the webmail interface for moderation activity.

The official Groups.io user documentation is in the Groups.io Help Center.